Crank-shaft lathe



H. BAERBALCK.

CRANK SHAFT LATHE.

APPLICATION EILED NOV-21,1919- RENEWED JULY 31,1922.

1,431,919. Patented Oct. 17,1922.

4 SHEETS-SHEET I.

H. BAERBALCK. CRANK SHAFT LATHE. APPLICATION man NOV. 21, 1919. RENEWEDJULY 3|. 1922. 1,431,919.

Patented Oct. 17,1922.

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b CRANK SHAFT LATHE. APPLICATION FILED NOV. 21, I919- RENEWED JULY 31,1922.

Patented Oct. 17, 1922.

4 SHEETSSHEET 3.

lll l II i. BAERBALCK. ChANK SHAFT LATHE. APPLICATION FILED NOV. 2|.1919. RENEWED JULY 31,1922. 919, Patented Oct. 17, 1922.

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Patented Get. 17, 1922.

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HANS IBAERBALGK, OF HAMILTON, OHIO.

CRANK-SHAFT LATHE.

Application filed. November 21, 1919, Serial No. 339,641. Renewed July31, 1922. Serial No. 578,846.

To all 107mm it may concern:

Be it known that I, HANs BAERBALOK, a citizen of Germany, residing atHamilton, in the county of Butler and State of Ohio, have inventedcertain new and useful Improvements in Crank-Shaft Lathes, of which thefollowing is a specification, reference being had therein to theaccompanying drawings.

My invention aims to provide a crank shaft lathe and finishing machineconstructed somewhat on the principle of an ordinary lathe and embodyingmany structural features which contribute to an expeditious andeconomical treatment' f crank shafts or pieces of work adapted to haveintermediate portions thereof rough, fine or otherwise finished.

First, the machine includes novel means for placing work holders inproper alinement with each other and also with a power shaft, so thatwhen-a piece of work is being operated upon there can be no twistingaction or dissimilarity in-any operations simultaneously performed on aSlIlglG'PlBCG of work. For 1nstance,'m the cutting and finishing of thecrank portion of a crank shaft it is essential that all bearing surfacesbe evenly and uniformly finished, particularly those offset bearingportions which must positively have the axes thereof in parallelism.

Second, the machine includes a positive and reliable means forautomatically shifting tools to and from a piece of work besides feedingthe tools when in en gagement with a piece of work and-1 the mechanismemployed for this purpose is constructively arranged so that the feedingof the tools may be at difierent speeds. For instance, the speed atwhich the tools are moved into and out of operative relation to a pieceof work is much faster than the speed at which tools are advanced whenactually operating on the piece of work, and in this manner productionis materially increased compared to a machine having but one toolfeeding speed. Provision is also made for automatically regulating thespeed of the machine and for automatically 'disconnecting the powerrelative to the machine, so it is possible for an operator or attendantof a machine to start the same and in the meantime give his attention toothers.

Third, the machineis designedlso' that it may used for other purposesthan that of rough or fine finishing a piece of work,

as the character of the work performed all depends 011 the nature of thetools used in the machine.

The above are some of the salient features of my invention and otherswill appear 'when reference is had to the drawings and a detaileddescription thereof, and in describing my invention it is to beunderstood that the structural elements are susceptible to suchvariations and modifications as fall within the scope of the claimswhich same;

Fig. tis a front elevation of the machine;

Fig. 5 is a cross section'alview taken on the line IVIV of Fig. t;

Fig. 6 is alongitudinal sectional view of the same;

Fig. 7 is a cross sectional view taken on the line VIL-VII of Fig. 6,and

Fig. 8 is a side elevation of a the machine.

The machine comprises a-bed or frame 1 having a longitudinal opening 2and at the rear edge of the frame is a-shear or way 3 throughout thelength thereof, while at the front edge'of the frame is a short shear orway 4c with a rack 5 on the lower face thereof.

Seated on the ends of the frame 1 and adadjustable thereon are what maybe considered head and tail stocks which are practically identical inconstruction, so I deem portion of it only necessary to describe one ofsaid stocks in detail. Each stock comprises parallel bearings '6 and 7that rest on the plain front edge of the frame land the shear or way 3at'the rear edge of said frame, and journaled in said bearings is alongitudinal stepped shaft Shaving a head 9' at the inner end thereofand a reduced exteriorly screwthreaded" shank 10at the opposite endthere- 'of, the shank being providedwith retaining nuts 11 to cooperatewith the head 9, the

bearings 6 and 7, and-the stepped portions of theshaft in preventing thelongitudinal displacement of said shaft relative to the bearings 6 and 7which are maintained in for rotation therewith, between the bearings 6and 7, is a hub portion 12 of a spider 13, said spider having its armsbifurcated or forked, as at 14, to receive lugs 15 carried by the faceof a herring bone gear 16 which surrounds the hub portion 12 of thespider 13 and is clamped against said spider by nuts 17 screwed on thehub .portion 12 of the spider, as best shown in Fig. 6. The lugs 15 ofthe gear 16 has stud bolts 18 extending through the bifurcated ends ofthe spider and held in engagement therewith by nuts 19 so by looseningthe nuts 17 and adjusting the nuts 19 it is possible to shift theherring bone gear relative to the spider 13 and the shaft 8.

Attached to the head 9 of the shaft 8, by screw bolts 20 or otherfastening means is i the head 21 of a crank shaft holder 22, said holderbeing channel shaped, as best shown in Fig. 5, so that the end of acrank shaft may be set therein and held by clamping devices, generallydesignated 23, said devices holding the crank shaft rigid relative tothe holder with pin portions 24 of the crank shaft 25 in axial alinementwith the shaft 8, so that when the shafts of said head and tail stocksare driven the pin portions 24 of the crank shaft 25 will be revolved inthe axes of the head and ta-il'stocks.

Suspended from the bearings- 6 and 7 of each stock by tie rods or screwbolts 26 are the end pieces 27 of gear housings 28, said gear housingslongitudinally alining so that a power shaft. 29 may be journaled insaid housings and provided with herring bone gears 30 meshing with theherring bone gears 16. One end of the power shaft 29 has a large gearwheel 31 representing a suitable power transmission wheel so that thepower shaft 29 may be driven from a motor or suitable source of power.

Interposed between the bearings 6 and T and the gear housings 28 arelongitudinally disposed tapered keys 32 that may be shifted by screws33, carried by the bear ings 6 and extending'into grooves in the keys32. By rotating the screws the keys 32 may be shifted, after the tierods or screw bolts 26 are loosened, so that the gear housings 28 may beadjusted relative to the bearings 6 and 7 and thus insure a proper meshof the gears 16 and 30. Itis through the medium of the keys 32 that thegears 30 may be adjusted relative to thegears '16 to compensate for anywear, and it is through the mediumof the spiders 13 and the bolts 18that the gears 16 may be circumferentially adjusted and cause the shafts8 to place the crank shaft in proper position;

Slidable on the shears or ways 3 and 4 of the frame 1 is a 'bed plate 34having a depending apron35 atone side of the frame 1 and said"apron'su-pports a pinion shaft 36 having a pinion 37 and a hand wheel38, said pinion meshing with the rack 5 so that when the hand wheel 38is revolved the bed plate 34 may be shifted longitudinally of the frame1.

Slidable transversely of the bed plate 34 and having a tongue and grooveconnection therewith is a table 39 supporting adjustable tool holders 40for tools 41 and 42, said tools being disposed in sets and positioned toalternately operate on the pin portions 24 of the crank shaft 25,'thetools being moved into and out of engagement with the crank shaft orpiece of work by sliding the table 39 on the bed plate 34. Theconstruction and mechanism contributing to such a movement of the table5.4 is as follows.

The rear side of the frame 1 has an enlargement 43 and adj ustablyconnected thereto is a bracket 44 provided with a longitudinal channelguide. 45 for a slide head 46 on which is detachably mounted a cam plate47. The upper face of the cam plate 47 has slow speed or work producinggrooves 48 and 49 connected by a fast speed groove 50 and by referenceto Fig. 1,. it will be noted that the grooves 48 and 49 are not exactlyparallel with the side edges of the cam plate 47 but are disposed at aslight angle thereto and it is the angularity of the grooves 48 and 49that produces a feeding movement for the sets of tools 41 and 42,whereby said tool will have a cutting action relative to the pinportions 24 of the crank shaft 25.

Extending into the groove 50 and adapted to enter the grooves 48 and 49is aroller 51 on a stud 52, carried by a rearward extension 53 of thetable 39, and when the cam plate is reciprocated the table 39 is movedtransversely of the bed' plate 34 to move the sets of tools 41 and 42into and out of operative relation to the crank shaft 25.

Adjustably connected to the slide head 46 is a pitman 54, and saidpitman is pivot-ally connected. to the face of a large worm wheel 55mounted on a shaft 56, 'journaled in the bracket 57 carried by theframe 1. Meshing with the worm wheel 55 is a worm 58 on a shaft 59journaled .in a U-shaped pivoted bearing 60 pivotally connected, at 61,to a bracket 62, carried by the frame 1. The bearing 60 has one endthereof pivoted so that the worm shaft may be raised and lowered andthereby shift the worm 58 into and out of engagement with the worm wheelThe pivoted end of the worm shaft 59 has change speed gears 63 and 64meshing with similar gears 65 and 66, respectively, on a shaft 67,journaled in the bracket 62 and another bracket 68 supported by theframe 1, as best shown in Figs. 1 and 3. The shaft 67 is driven by anendless sprocket chain 69 from an extension 70 of the shaft 8 of thetail stock and the change speed gears 63 to 66 inclusive areproportioned for two speeds and the speed controlled by a conventionalform of clutch 71 associated with a shaft 67. The change speed gears and66 are loose on the shaft 67 and may be fixed relative to said shaft soas to impart movement to the worm shaft 59 by shifting the clutch intoengagement with either of said gears, and this is accomplished by atransverse rock shaft 7 4, jonrnaled in bearings 72 carried by the frontand rear walls of the frame 1. The rear end of the rock shaft 71 has afork 73 engaging the clutch 7.1 and the front end of the rock shaft 74has a slotted crank 75. The slotted crank 75 is articulated with a slidebar 76 in a bracket 77, carried by the front wall of the frame 1, andsaid slide bar has a roller 78 in proximity to the face of the timerwheel 79, which is mounted on a shaft 80 j'ournaled in the bracket 77.

The face of the timer wheel 79 is provided with inner and outer annulargrooves 81 for sets of cams 82 and 83 which are adjustable in thegrooves 81 and are adapted to be set to engage the roller 78 and slidebar 76, so as to reciprocate said slide bar in a desired direction. Theset of earns 82 will shift the slide bar 7 6 in one direction and theset of cams 83 shift said slide bar in an opposite direction, and withsaid cams adjustable in the grooves 81 of the wheel 79 it is possible toposition said cams so that one movement of the slide bar will be intimed relation to another movement thereof, all. of which depends on thespeed of the timer wheel 79.

To impart movement to the timer wheel 7 9 the shaft 80 is provided withagear wheel 84 meshing with a gear wheel 85 on a transverse shaft 86journaled in suitable bearings carried by the front and rear walls ofthe frame 1. The rear end of the shaft 86. has a gear Wheel 87 meshingwith a gear wheel 88 on the shaft 56 and in consequence of this train ofgears the timer wheel 79 may be driven indirectly from the worm shaft59.

The timer wheel 79 is also employed for causing a cessation in theoperation of the machine by permitting the worm 58 to drop by gravityout of engagement with the worm wheel 55, and this is accomplished byproviding the timer wheel 7 9 with a radial projection 89 on itsperiphery to engage the upper end of a trip lever 90 supported by thefront wall of the frame 1 and best shown in Fig 4. The trip lever 90 hasits lower end notched to engage a double crank 91 on a transverse shaft92, journaled in bearings 93 of the frame 1, said double crank having ahandle 94 so that it may be manually manipulated to elevate the worm 58for engagement with the worm wheel 55, so that the machine may bestarted.

On the rear end of the shaft 92 is a crank 95 having a slottedengagement with a pin 96 on the free end of the pivoted bearing 60, andwhen the shaft 92 is rocked the free end of the bearing 60 may be raisedand lowered so as to move the worm 58 into and out of engagement withthe worm wheel 55.

To prevent accidental shifting of the clutch operating mechanism, theclutch fork 73 has a depending lug 97 normally engaged by a pivotedspring held arm 98, as best shown in Fig. 2, said arm being heldconstantly in engagei'nent. with the lug 97 but capable of yielding whenthe clutch fork 7 3 is shifted by the rock shaft 74-.

In operation, I will assume that the worm 58 is in engagement with theworm wheel 55 and that the machine is started by applying power to theshaft 29. The herring bone gears 30 and 16 will revolve the crank shaft25 or the piece of work in the holders 22 so that the pin portions 24 ofthe crank shaft will be turned about a common axis; Power is transmittedfrom the shaft 8 of the tail stock to the shaft 67, and according to theposition of the table 39 relative to the cam plate 47, as shown in Fig.1, the change speed gears 63 to 66 inclusive are in high speed, the setof tools 42 rapidly advancing towards the pin portions 24 of the crankshaft 25, and the set of tools 41 rapidly receding from the crank shaft.This comparatively rapid movement of the table 39 continues until theroller stud 52 reaches the groove 48 of the cam plate 47, when there isa change in speed brought about by the timer wheel 79. F or instance,one of the cams 82 impinges against the end of the slide bar 76 and theshaft 74 is rocked to shift the clutch 71 and change the speed of theshaft 59 so that the worm wheel 55 will be slowly revolved to shift thecam plate 47. A slight angle of the groove 48 is sufficient to feed theset of tools 42 while the peripheries of the pin portion 24 of the crankshaft 25 are ground to either rough or fine finish according to thenature of the sets of tools 41 and '42.

Immediately upon the operation being completed by a set of tools 42, oneof the cams 83 of the timer wheel 79 actuates the slide bar 76, rockshaft 74 and changes the rotation of the worm shaft 59 from low speed tohigh speed so that the cam plate 47 will. be rapidly shifted andtransfer the roller stud 52 from the outer end of the groove 48 throughthe groove 50 to the inner end of the groove 49. The time wheel v7'9again comes into action. to produce a slow speed in connection with theworm shaft 59 and the set of tools 41 are slowly advanced whileoperating on the pin portions 24 of the crank shaft 25. After these twooperations by the sets of tools 42 and 41 the timer wheel causes acessation in the operation of the machine by the peripheral lug 89 ofthe .timer wheel 79 actuating the trip lever 90 which releases thetransverse shaft 92 and permits the free end of the pivoted bearing 60to drop by gravity and thereby move the worm 58 out of engagement withthe worm wheel The tools ll and 42 are thus rendered inactive and theoperator or ati tendant of the machine can shut off the power to theshaft 29, but it is obvious that suitable connections can be made withthe power so that when the trip lever 90 is actuated, the power will besimultaneously i0 shut off with a'cessation in the movement of the setsof tools 41 and 42.

I attach considerable importance to the shafts 8 being adjustable in thegears 16, since after the-crank shaft is placed in the holders 22 theshafts 8 can be adjusted rela- 25 holder, a change speed mechanismcontrolling the movement of said tools, a timer wheel controlling theoperation of said change speed mechanism, and a worm and gear interposedbetween said change speed mechanism and said tools and constructivelyarranged to be controlled by said timer wheel.

2. A machine of the type described comprising revoluble work holders, apower shaft disposed parallel to said work holders, means employed foradjusting and maintaining the work holders in alinement with each otherand said power shaft in positive operative relation to said workholders, tools adapted '40 to he alternately shifted into and out ofengagement with a piece of work in said holders, change speed mechanismcontrolling the movement of said tools, and a timer wheel controllingthe operation of' said change speed mechanism.

3. A machine of the type described comprising revoluble work holders,tools adapted to be alternately shifted. into and outof engagement witha piece of work in said work holders, a cam adapted to move said tools,a worm and gear for imparting movement to said cam, and means adapted toto the front side of the machine and is automatically actuated.

5. A machine of the type described comprising revoluble work holders, ahorizontally disposed cam plate adapted to shift tools into and out ofoperativerelation to a piece ,of work held by said work holders,variable speed operating means for said cam plate, a timer wheeloperated through said variable speed operating means, and means actuatedby said timer wheel to cause a cessation in the operation of said camplate independent ofsaid variable speed operating means. l

6. A machine as characterized in claim 5, wherein the last mentionedmeans includes a trip lever that may be manually set to place said camplate in operation.

7. A machine as characterized in claim 5, wherein means is interposedbetween said timer wheel and said variable speed operating means so thatsaid timer wheel may cause changes of speed in said operating means.

v8. A machine of the type described comprising housings, shaftsjournaled in said housings and adapted for holding a piece of work, apower shaft,herringbone gears transmitting power from said power shaftto said shafts, and means interposed hetween said shafts and the herringbone gears thereof so that said shafts may be adjusted relative to saidherring bone gears to properly aline a piece of work with said shafts.

. 9, A machine as characterized in claim 8, wherein said means includesspiders fixed on. said shafts and adapted for adjust-ably holding thegears of said shafts.

10. A. machine of the type described comprising longitudinally aliningholders adapted for supporting a crank shaft, means for impartingrotation to said holders, and means interposed between said holders andtne first mentioned means so that said holders may be circumferentiallyad usted relative to the first mentioned means.

In testimony whereof I aflix my signature iii the presence of twowitnesses.

HANS BAER-BALCK.

shift said worm relative to its gear to cause lViti1esses: a cessationin the operation of said cam. KARL H. BUTLER, 55 4. A machine ascharacterized in claim 3, ANNA .M. Donn.

